package com.atguigu.eduservice.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.atguigu.eduservice.entity.EduSubject;
import com.atguigu.eduservice.entity.excel.SubjectData;
import com.atguigu.eduservice.service.SubjectService;
import com.atguigu.servicebase.exceptionhandler.GuliException;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;

/**
 * @author shkstart
 * @create 2022-09-18 21:29
 */
public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {

    //因为SubjectExcelListener不能交给spring进行管理，需要自己new，不能注入其他对象
    //不能实现数据库操作
    public SubjectService subjectService;

    public SubjectExcelListener() {

    }

    public SubjectExcelListener(SubjectService subjectService) {
        this.subjectService = subjectService;
    }

    //读取excel中的内容，一行一行进行读取
    @Override
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {
        System.out.println(subjectData);
        if (subjectData ==null){
            throw new GuliException(20001,"文件数据为空");
        }

        //一行一行读取，每次读取有两个值，第一个值一级分类，第二个值二级分类
        //判断一级分类是否重复
        EduSubject existOneSubject = this.existOneSubject(subjectService, subjectData.getOneSubjectName());
        if (existOneSubject == null){ //没有相同一级分类，进行添加
            //创建实体类对象，进行添加赋值
            existOneSubject = new EduSubject();
            //一级分类内容赋值
            existOneSubject.setParentId("0");
            existOneSubject.setTitle(subjectData.getOneSubjectName());
            //存到数据库中
            subjectService.save(existOneSubject);
        }

        String pid = existOneSubject.getId();
        //添加二级分类
        //先判断二级分类是否重复
        //existOneSubject.getId() 获取一级分类id值
        EduSubject existTwoSubject = this.existTwoSubject(subjectService, subjectData.getTwoSubjectName(),pid );
        if (existTwoSubject ==null){//没有相同二级分类进行添加
            existTwoSubject = new EduSubject();
            existTwoSubject.setTitle(subjectData.getTwoSubjectName());//二级分类名称
            existTwoSubject.setParentId(pid);
            subjectService.save(existTwoSubject);
        }

    }

    //判断一级分类不能重复添加
    private EduSubject existOneSubject(SubjectService subjectService,String name){
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id","0");
        //返回唯一的一级分类
        EduSubject oneSubject = subjectService.getOne(wrapper);
        return oneSubject;
    }

    //判断二级分类不能重复添加
    private EduSubject existTwoSubject(SubjectService subjectService,String name,String pid){
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);
            wrapper.eq("parent_id",pid);
        //返回唯一的一级分类
        EduSubject twoSubject = subjectService.getOne(wrapper);
        return twoSubject;
    }


    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }
}
